package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){
    }

    /**
     * 前置通知，在通知中进行公共字段的赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段的填充...");
        //判断当前被拦截的方法的注解是INSERT还是UPDATE
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        //1.获得当前的被拦截的实体对象
        OperationType operationType = annotation.value();
        Object[] args = joinPoint.getArgs();//实体参数放第一位
        if(args==null||args.length==0){
            return;
        }
        Object pojo = args[0];
        //2.准备为公共对象赋值（需要定义数据）
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();


        //3.赋值
        if(operationType == OperationType.INSERT){
            try {
                Method setCreateTime = pojo.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = pojo.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = pojo.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = pojo.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setCreateTime.invoke(pojo,now);
                setUpdateTime.invoke(pojo,now);
                setCreateUser.invoke(pojo,currentId);
                setUpdateUser.invoke(pojo,currentId);
            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        }else if(operationType == OperationType.UPDATE){
            try {
                Method setUpdateUser = pojo.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER , Long.class);
                Method setUpdateTime = pojo.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                setUpdateTime.invoke(pojo,now);
                setUpdateUser.invoke(pojo,currentId);
            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        }
    }
}
